//base64.js   第一步
    var Base64 = {
        // private property
        _keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
        // public method for encoding
        encode : function (input) {
            var output = "";
            var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
            var i = 0;

            input = Base64._utf8_encode(input);

            while (i < input.length) {

                chr1 = input.charCodeAt(i++);
                chr2 = input.charCodeAt(i++);
                chr3 = input.charCodeAt(i++);

                enc1 = chr1 >> 2;
                enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
                enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
                enc4 = chr3 & 63;

                if (isNaN(chr2)) {
                    enc3 = enc4 = 64;
                } else if (isNaN(chr3)) {
                    enc4 = 64;
                }

                output = output +
                this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) +
                this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4);

            }

            return output;
        },

        // public method for decoding
        decode : function (input) {
            var output = "";
            var chr1, chr2, chr3;
            var enc1, enc2, enc3, enc4;
            var i = 0;

            input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

            while (i < input.length) {

                enc1 = this._keyStr.indexOf(input.charAt(i++));
                enc2 = this._keyStr.indexOf(input.charAt(i++));
                enc3 = this._keyStr.indexOf(input.charAt(i++));
                enc4 = this._keyStr.indexOf(input.charAt(i++));

                chr1 = (enc1 << 2) | (enc2 >> 4);
                chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
                chr3 = ((enc3 & 3) << 6) | enc4;

                output = output + String.fromCharCode(chr1);

                if (enc3 != 64) {
                    output = output + String.fromCharCode(chr2);
                }
                if (enc4 != 64) {
                    output = output + String.fromCharCode(chr3);
                }

            }

            output = Base64._utf8_decode(output);

            return output;

        },

        // private method for UTF-8 encoding
        _utf8_encode : function (string) {
            string = string.replace(/\r\n/g,"\n");
            var utftext = "";

            for (var n = 0; n < string.length; n++) {

                var c = string.charCodeAt(n);

                if (c < 128) {
                    utftext += String.fromCharCode(c);
                }
                else if((c > 127) && (c < 2048)) {
                    utftext += String.fromCharCode((c >> 6) | 192);
                    utftext += String.fromCharCode((c & 63) | 128);
                }
                else {
                    utftext += String.fromCharCode((c >> 12) | 224);
                    utftext += String.fromCharCode(((c >> 6) & 63) | 128);
                    utftext += String.fromCharCode((c & 63) | 128);
                }

            }

            return utftext;
        },

        // private method for UTF-8 decoding
        _utf8_decode : function (utftext) {
            var string = "";
            var i = 0;
            var c = c1 = c2 = 0;

            while ( i < utftext.length ) {

                c = utftext.charCodeAt(i);

                if (c < 128) {
                    string += String.fromCharCode(c);
                    i++;
                }
                else if((c > 191) && (c < 224)) {
                    c2 = utftext.charCodeAt(i+1);
                    string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
                    i += 2;
                }
                else {
                    c2 = utftext.charCodeAt(i+1);
                    c3 = utftext.charCodeAt(i+2);
                    string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
                    i += 3;
                }

            }

            return string;
        }

    }

module.exports = Base64;

//crypto.js  第二步
/*!
 * Crypto-JS v1.1.0
 * http://code.google.com/p/crypto-js/
 * Copyright (c) 2009, Jeff Mott. All rights reserved.
 * http://code.google.com/p/crypto-js/wiki/License
 */

var base64map = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

// Global Crypto object
const Crypto = {};

// Crypto utilities
Crypto.util = {
  // Bit-wise rotate left
  rotl: function(n, b) {
    return (n << b) | (n >>> (32 - b));
  },

  // Bit-wise rotate right
  rotr: function(n, b) {
    return (n << (32 - b)) | (n >>> b);
  },

  // Swap big-endian to little-endian and vice versa
  endian: function(n) {

    // If number given, swap endian
    if (n.constructor == Number) {
      return util.rotl(n, 8) & 0x00FF00FF |
        util.rotl(n, 24) & 0xFF00FF00;
    }

    // Else, assume array and swap all items
    for (var i = 0; i < n.length; i++)
      n[i] = util.endian(n[i]);
    return n;

  },

  // Generate an array of any length of random bytes
  randomBytes: function(n) {
    for (var bytes = []; n > 0; n--)
      bytes.push(Math.floor(Math.random() * 256));
    return bytes;
  },

  // Convert a string to a byte array
  stringToBytes: function(str) {
    var bytes = [];
    for (var i = 0; i < str.length; i++)
      bytes.push(str.charCodeAt(i));
    return bytes;
  },

  // Convert a byte array to a string
  bytesToString: function(bytes) {
    var str = [];
    for (var i = 0; i < bytes.length; i++)
      str.push(String.fromCharCode(bytes[i]));
    return str.join("");
  },

  // Convert a string to big-endian 32-bit words
  stringToWords: function(str) {
    var words = [];
    for (var c = 0, b = 0; c < str.length; c++, b += 8)
      words[b >>> 5] |= str.charCodeAt(c) << (24 - b % 32);
    return words;
  },

  // Convert a byte array to big-endian 32-bits words
  bytesToWords: function(bytes) {
    var words = [];
    for (var i = 0, b = 0; i < bytes.length; i++, b += 8)
      words[b >>> 5] |= bytes[i] << (24 - b % 32);
    return words;
  },

  // Convert big-endian 32-bit words to a byte array
  wordsToBytes: function(words) {
    var bytes = [];
    for (var b = 0; b < words.length * 32; b += 8)
      bytes.push((words[b >>> 5] >>> (24 - b % 32)) & 0xFF);
    return bytes;
  },

  // Convert a byte array to a hex string
  bytesToHex: function(bytes) {
    var hex = [];
    for (var i = 0; i < bytes.length; i++) {
      hex.push((bytes[i] >>> 4).toString(16));
      hex.push((bytes[i] & 0xF).toString(16));
    }
    return hex.join("");
  },

  // Convert a hex string to a byte array
  hexToBytes: function(hex) {
    var bytes = [];
    for (var c = 0; c < hex.length; c += 2)
      bytes.push(parseInt(hex.substr(c, 2), 16));
    return bytes;
  },

  // Convert a byte array to a base-64 string
  bytesToBase64: function(bytes) {

    // Use browser-native function if it exists
    if (typeof btoa == "function") return btoa(util.bytesToString(bytes));

    var base64 = [],
      overflow;

    for (var i = 0; i < bytes.length; i++) {
      switch (i % 3) {
        case 0:
          base64.push(base64map.charAt(bytes[i] >>> 2));
          overflow = (bytes[i] & 0x3) << 4;
          break;
        case 1:
          base64.push(base64map.charAt(overflow | (bytes[i] >>> 4)));
          overflow = (bytes[i] & 0xF) << 2;
          break;
        case 2:
          base64.push(base64map.charAt(overflow | (bytes[i] >>> 6)));
          base64.push(base64map.charAt(bytes[i] & 0x3F));
          overflow = -1;
      }
    }

    // Encode overflow bits, if there are any
    if (overflow != undefined && overflow != -1)
      base64.push(base64map.charAt(overflow));

    // Add padding
    while (base64.length % 4 != 0) base64.push("=");

    return base64.join("");

  },
  // Convert a base-64 string to a byte array
  base64ToBytes: function(base64) {

    // Use browser-native function if it exists
    if (typeof atob == "function") return util.stringToBytes(atob(base64));

    // Remove non-base-64 characters
    base64 = base64.replace(/[^A-Z0-9+\/]/ig, "");

    var bytes = [];

    for (var i = 0; i < base64.length; i++) {
      switch (i % 4) {
        case 1:
          bytes.push((base64map.indexOf(base64.charAt(i - 1)) << 2) |
            (base64map.indexOf(base64.charAt(i)) >>> 4));
          break;
        case 2:
          bytes.push(((base64map.indexOf(base64.charAt(i - 1)) & 0xF) << 4) |
            (base64map.indexOf(base64.charAt(i)) >>> 2));
          break;
        case 3:
          bytes.push(((base64map.indexOf(base64.charAt(i - 1)) & 0x3) << 6) |
            (base64map.indexOf(base64.charAt(i))));
          break;
      }
    }

    return bytes;

  },
  HMAC: function(hasher, message, key, options) {

    // Allow arbitrary length keys
    key = key.length > 16 * 4 ?
      hasher(key, {
        asBytes: true
      }) :
      Crypto.util.stringToBytes(key);

    // XOR keys with pad constants
    var okey = key,
      ikey = key.slice(0);
    for (var i = 0; i < 16 * 4; i++) {
      okey[i] ^= 0x5C;
      ikey[i] ^= 0x36;
    }

    var hmacbytes = hasher(Crypto.util.bytesToString(okey) +
      hasher(Crypto.util.bytesToString(ikey) + message, {
        asString: true
      }), {
        asBytes: true
      });
    return options && options.asBytes ? hmacbytes :
      options && options.asString ? Crypto.util.bytesToString(hmacbytes) :
      Crypto.util.bytesToHex(hmacbytes);

  },
  sha11: function(k) {
    var u = Crypto.util.stringToWords(k),
      v = k.length * 8,
      o = [],
      q = 1732584193,
      p = -271733879,
      h = -1732584194,
      g = 271733878,
      f = -1009589776;
    u[v >> 5] |= 128 << (24 - v % 32);
    u[((v + 64 >>> 9) << 4) + 15] = v;
    for (var y = 0; y < u.length; y += 16) {
      var D = q,
        C = p,
        B = h,
        A = g,
        z = f;
      for (var x = 0; x < 80; x++) {
        if (x < 16) {
          o[x] = u[y + x]
        } else {
          var s = o[x - 3] ^ o[x - 8] ^ o[x - 14] ^ o[x - 16];
          o[x] = (s << 1) | (s >>> 31)
        }
        var r = ((q << 5) | (q >>> 27)) + f + (o[x] >>> 0) + (x < 20 ? (p & h | ~p & g) + 1518500249 : x < 40 ? (p ^ h ^ g) + 1859775393 : x < 60 ? (p & h | p & g | h & g) - 1894007588 : (p ^ h ^ g) - 899497514);
        f = g;
        g = h;
        h = (p << 30) | (p >>> 2);
        p = q;
        q = r
      }
      q += D;
      p += C;
      h += B;
      g += A;
      f += z
    }
    return [q, p, h, g, f]
  },
  SHA1: function(e, c) {
    var d = Crypto.util.wordsToBytes(Crypto.util.sha11(e));
    return c && c.asBytes ? d : c && c.asString ? Crypto.util.bytesToString(d) : Crypto.util.bytesToHex(d)
  }

};

// Crypto mode namespace
Crypto.mode = {};

module.exports = Crypto;

//第三步  alioss.js
const Base64 = require('./base64.js');
const Crypto = require('./crypto.js');
const host= '阿里云服务器地址'
const aliOSS = {
  accessKeyID: '阿里云keyid',
  accessKeySecret: '阿里云秘钥',
  host: host,
  timeout: 87600,  
};

 function uploadFile(filePath,cataLog,aliyunFileKey = (new Date().getTime())) {
  return new Promise(function (resolve, reject) {
    if (!filePath) {
      reject({
        status: false,
        err:'文件错误',
      });
      return;
    }
    //文件后缀
    let dotIndex = filePath.lastIndexOf('.');
    let filePathLength = filePath.length;
    let suffix = filePath.substring(dotIndex, filePathLength);

    // 身份证号码或者时间戳
    aliyunFileKey = aliyunFileKey + '.' + suffix;

    const aliyunServerURL = aliOSS.host;
    const accessid = aliOSS.accessKeyID;
    const policyBase64 = Base64.encode(JSON.stringify({
      "expiration": new Date(new Date().getTime() + aliOSS.timeout).toISOString(),
      "conditions": [
        ["content-length-range", 0, 1024 * 1024 * 10]//10m
      ]
    }));
    let bytes = Crypto.util.HMAC(Crypto.util.SHA1, policyBase64, aliOSS.accessKeySecret, { asBytes: true });
    const signature = Crypto.util.bytesToBase64(bytes);
    wx.uploadFile({
      url: aliyunServerURL,
      filePath: filePath,
      name: 'file',
      header:{
        'Content-Type': 'image/jpg'
      },
      formData: {
        'key': `${cataLog}/${aliyunFileKey}`,
        'OSSAccessKeyId': aliOSS.accessKeyID,
        'policy': policyBase64,
        'Signature': signature,
        'success_action_status': '200',
      },
      success: function (res) {
        if (res.errMsg === 'uploadFile:ok') {
          let url = aliyunServerURL 
          resolve({
            status: true,
            data:{
              url: url+`/${cataLog}/${aliyunFileKey}`,
            },
            err: '',
          });
        }
      },
      fail: function (err) {
        reject({
          status: false,
          err,
        });
      },
    })
  });
}

module.exports = {
  uploadFile: uploadFile
}

//使用  第四步
const { uploadFile } = require('../alioss.js')
uploadFile('base64URL','阿里云保存图片的文件名','身份证号也就是图片名称可写可不写')
 uploadFile(url,'idImageFront',idNumber).then((value)=>{     
      },function(res){
      })

//ps 小程序临时图片转base64
base64(url){
  return new Promise((resolve, reject) => {
    wx.getFileSystemManager().readFile({
      filePath: url, //选择图片返回的相对路径
      encoding: 'base64', //编码格式
      success: res => {
        resolve('data:image/jpeg' + ';base64,' + res.data)
      },
      fail: res => reject(res.errMsg)
    })
  })
},